// 判断屏幕是否旋转
function orientationChange() {

    switch(window.orientation) {

        case 0:

            alert("肖像模式 0,screen-width: " + screen.width + "; screen-height:" + screen.height);
            

            break;


        case 180:

            alert("风景模式 180,screen-width: " + screen.width + "; screen-height:" + screen.height);

            break;

    }
}

// 添加事件监听

addEventListener('load', function(){

    orientationChange();

    window.onorientationchange = orientationChange;

});

